Managing communication in a wireless communication network

ABSTRACT

Embodiments herein relate to a method performed by a wireless device ( 10 ) for managing communication in a wireless communication network. The wireless device receives reference signals from one or more radio network nodes. The wireless device ( 10 ) estimates to what extent the received reference signals are received spatially diversified based on a radio network node indication indicating from which radio network node the reference signal was sent, and/or on a beam indication indicating in what direction the reference signal was sent toward the wireless device. The wireless device ( 10 ) then generates a measurement report by adding selected reference signals into the measurement report, which reference signals are selected for simultaneous multiple transmissions of data to the wireless device ( 10 ) taking into account the estimated extent that the received reference signals are received spatially diversified. The wireless device ( 10 ) then transmits the measurement report to a radio network node ( 12 ) in the wireless communication network ( 1 ).

TECHNICAL FIELD

Embodiments herein relate to a wireless device, a radio network node andmethods performed therein regarding wireless communication. Furthermore,a computer program and a computer-readable storage medium are alsoprovided herein. In particular, embodiments herein relate to managingcommunication in a wireless communication network.

BACKGROUND

In a typical wireless communication network, wireless devices, alsoknown as wireless communication devices, mobile stations, stations (STA)and/or user equipments (UE), communicate via a Radio access Network(RAN) to one or more core networks (CN). The RAN covers a geographicalarea which is divided into service areas or cell areas, with eachservice area or cell area being served by radio network node such as anaccess node e.g. a Wi-Fi access point or a radio base station (RBS),which in some networks may also be called, for example, a “NodeB” or“eNodeB”. The service area or cell area is a geographical area whereradio coverage is provided by the access node. The access node operateson radio frequencies to communicate over an air interface with thewireless devices within range of the access node. The access nodecommunicates over a downlink (DL) to the wireless device and thewireless device communicates over an uplink (UL) to the access node.

A Universal Mobile Telecommunications System (UMTS) is a thirdgeneration telecommunication network, which evolved from the secondgeneration (2G) Global System for Mobile Communications (GSM). The UMTSterrestrial radio access network (UTRAN) is essentially a RAN usingwideband code division multiple access (WCDMA) and/or High-Speed PacketAccess (HSPA) for communication with user equipments. In a forum knownas the Third Generation Partnership Project (3GPP), telecommunicationssuppliers propose and agree upon standards for present and futuregeneration networks and UTRAN specifically, and investigate enhanceddata rate and radio capacity. In some RANs, e.g. as in UMTS, severalaccess nodes may be connected, e.g., by landlines or microwave, to acontroller node, such as a radio network controller (RNC) or a basestation controller (BSC), which supervises and coordinates variousactivities of the plural access nodes connected thereto. The RNCs aretypically connected to one or more core networks.

Specifications for the Evolved Packet System (EPS) have been completedwithin the 3^(rd) Generation Partnership Project (3GPP) and this workcontinues in the coming 3GPP releases, such as 4G and 5G networks. TheEPS comprises the Evolved Universal Terrestrial Radio Access Network(E-UTRAN), also known as the Long-Term Evolution (LTE) radio accessnetwork, and the Evolved Packet Core (EPC), also known as SystemArchitecture Evolution (SAE) core network. E-UTRAN/LTE is a 3GPP radioaccess technology wherein the access nodes are directly connected to theEPC core network. As such, the Radio Access Network (RAN) of an EPS hasan essentially “flat” architecture comprising access nodes connecteddirectly to one or more core networks.

With the emerging 5G technologies, the use of very many transmit- andreceive-antenna elements is of great interest as it makes it possible toutilize beamforming, such as transmit-side and receive-side beamforming.Transmit-side beamforming means that the transmitter can amplify thetransmitted signals in a selected direction or directions, whilesuppressing the transmitted signals in other directions. Similarly, onthe receive-side, a receiver can amplify signals from a selecteddirection or directions, while suppressing unwanted signals from otherdirections.

Beamforming allows the signal to be stronger for an individualconnection. On the transmit-side this may be achieved by a concentrationof the transmitted power in the desired direction(s), and on thereceive-side this may be achieved by an increased receiver sensitivityin the desired direction(s). This beamforming enhances throughput andcoverage of the connection. It also allows reducing the interferencefrom unwanted signals, thereby enabling several simultaneoustransmissions over multiple individual connections using the sameresources in the time-frequency grid, so-called multi-user MultipleInput Multiple Output (MIMO).

Overall requirements for the Next Generation (NG) architecture e.g. TR23.799 v.0.5.0, and, more specifically the NG Access Technology, e.g. TR38.913 v.0.3.0 will impact the design of the Active Mode Mobilitysolutions for the New Radio Access Technology (NR), see RP-160671 NewSID Proposal: Study on New Radio Access Technology, DoCoMo, compared tothe current mobility solution in LTE. Some of these requirements are theneed to support network energy efficiency mechanisms, future-proof-nessand the need to support a very wide range of frequencies e.g. up to 100GHz.

One of the main differences, with respect to LTE, comes from the factthat propagation in frequencies above the ones allocated to LTE is morechallenging so that the massive usage of beamforming becomes anessential component of NR. Despite the link budget gains provided bybeamforming solutions, reliability of a system purely relying onbeamforming and operating in higher frequencies might be challenging,since the coverage might be more sensitive to both time and spacevariations. As a consequence of that a Signal to Interference plus NoiseRatio (SINR) of a narrow link can drop much quicker than in the case ofLTE, see R2-162762, Active Mode Mobility in NR: SINR drops in higherfrequencies, Ericsson.

To support Transmit (Tx)-side beamforming at a radio network node, anumber of reference signals (RS) may be transmitted from the radionetwork node, whereby the wireless device can measure signal strength orquality of these reference signals and report the measurement results tothe radio network node. The radio network node may then use thesemeasurements to decide which beam(s) to use for the one or more wirelessdevices.

A combination of periodic and scheduled reference signals may be usedfor this purpose.

The periodic reference signals, typically called beam reference signals(BRS) or Mobility Reference Signals (MRS), are transmitted repeatedly,in time, in a large number of different directions using as manyTx-beams as deemed necessary to cover a service area of the radionetwork node. As the naming indicates, each BRS represents a uniqueTx-beam from that radio network node. This allows a wireless device tomeasure the BRS when transmitted in different beams, without any specialarrangement for that wireless device from the radio network nodeperspective. The wireless device reports e.g. the received powers fordifferent BRSs, or equivalently different Tx-beams, back to the radionetwork node.

The scheduled reference signals, called channel-state informationreference signals (CSI-RS), are transmitted only when needed for aparticular connection. The decision when and how to transmit the CSI-RSis made by the radio network node and the decision is signalled to theinvolved wireless devices using a so-called measurement grant. When thewireless device receives a measurement grant it measures on acorresponding CSI-RS. The radio network node may choose to transmitCSI-RSs to a wireless device only using beam(s) that are known to bestrong for that wireless device, to allow the wireless device to reportmore detailed information about those beams. Alternatively, the radionetwork node may choose to transmit CSI-RSs also using beam(s) that arenot known to be strong for that wireless device, for instance to enablefast detection of new beam(s) in case the wireless device is moving.

The radio network nodes of a NR network transmit other reference signalsas well. For instance, the radio network nodes may transmit so-calleddemodulation reference signals (DMRS) when transmitting controlinformation or data to a wireless device. Such transmissions aretypically made using beam(s) that are known to be strong for thatwireless device.

Beamforming introduces a possibility to enhance the signal toward aspecific location. This enables better signal to noise ratio toward aspecific wireless device.

A specific beamforming toward a specific wireless device is handled perTransmission Time Interval (TTI) where a number of factors andmeasurements are used to determine how the beamforming should look like.With an increasing number of antenna elements, the number of possiblebeams that theoretically can be created increases a lot.

A wireless communication system comprises radio network nodes, alsoreferred to as transmission points (TPs), and wireless devices. Theradio network nodes employ beamforming, that is, the radio network nodestransmit their power in a prominent direction to increase the receivedpower at the wireless devices. A radio network node may use a certainbeamforming where beams are used from a finite set of pre-defined beams.It should also be understood the radio network node can use several ofthe beams at a same time. The radio network node periodically sendsreference signals on each of the possible beams, such as the BRS or MRS.

The wireless device measures signal strength or quality such asreference signal received power (RSRP) for each of the reference signalse.g. beam reference signal received power (BRSRP). The wireless devicethen reports the signal strength or quality back to the radio networknode.

There are two properties of the reporting:

Firstly, the wireless device is only able to report a finite number ofsignal strengths or qualities. This is to limit communication resourcesin the uplink;

Secondly, the wireless device only reports the position of the detectedreference signal in time and possibly frequency domain. The wirelessdevice does not know what radio network node that sent the referencesignal and what beam was used at the radio network node. Thistransparency of radio network node and beam information has theadvantage of providing flexible reference signal transmissions. That is,the radio network nodes can change when and from what radio network nodethe reference signals are sent, without sending this information to thewireless devices.

The wireless devices report the reference signals with the highestsignal strengths or qualities and corresponding indications identifyingwhich reference signals are reported. The two properties mentioned abovemay in some situations limit the number of beams reported back and thismay result in that some important information is not collected at theradio network node. This may result in a poor selection of beams for thewireless device reducing or limiting performance of the wirelesscommunication network.

SUMMARY

An object of embodiments herein is to provide a mechanism that improvesthe performance of the wireless communication network when performingbeamforming in a wireless communication network when using multipletransmissions of data toward a wireless device.

According to an aspect the object is achieved by providing a methodperformed by a wireless device for managing communication in a wirelesscommunication network. The wireless device receives reference signalsfrom one or more radio network nodes. The wireless device estimates towhat extent the received reference signals are received spatiallydiversified based on a radio network node indication indicating fromwhich radio network node a reference signal was sent, and/or a beamindication indicating in what direction the reference signal was senttoward the wireless device. The wireless device generates a measurementreport by adding selected reference signals into the measurement report,which reference signals are selected for simultaneous multipletransmissions of data to the wireless device taking into account theestimated extent that the received reference signals are receivedspatially diversified. The wireless device transmits the measurementreport to a radio network node in the wireless communication network.

According to another aspect the object is achieved by providing a methodperformed by radio network node for managing communication of a wirelessdevice in a wireless communication network. The radio network nodetransmits configuration data to the wireless device, which configurationdata indicates a mapping of reference signals to radio network nodeindications and/or beam indications. The radio network node furtherreceives a measurement report comprising selected reference signals,which reference signals are selected for simultaneous multipletransmissions of data to the wireless device taking into account to whatestimated extent received reference signals are received spatiallydiversified. Furthermore, the radio network node determines referencesignals or beams to use for simultaneous multiple transmissions of datatoward the wireless device taking the received measurement report intoaccount.

According to yet another aspect the object is achieved by providing awireless device for enabling managing communication in a wirelesscommunication network. The wireless device is configured to receivereference signals from one or more radio network nodes, and to estimateto what extent the received reference signals are received spatiallydiversified based on a radio network node indication indicating fromwhich radio network node a reference signal was sent, and/or a beamindication indicating in what direction the reference signal was senttoward the wireless device. The wireless device is further configured togenerate a measurement report by adding selected reference signals intothe measurement report, which reference signals are selected forsimultaneous multiple transmissions of data to the wireless devicetaking into account the estimated extent that the received referencesignals are received spatially diversified. Furthermore, the wirelessdevice is configured to transmit the measurement report to a radionetwork node in the wireless communication network.

According to still another aspect the object is achieved by providing aradio network node for managing communication of a wireless device in awireless communication network. The radio network node is configured totransmit configuration data to the wireless device, which configurationdata indicates a mapping of reference signals to radio network nodeindications and/or beam indications. The radio network node is furtherconfigured to receive a measurement report comprising selected referencesignals, which reference signals are selected for simultaneous multipletransmissions of data to the wireless device taking into account to whatestimated extent received reference signals are received spatiallydiversified. Furthermore, the radio network node is configured todetermine reference signals or beams to use for simultaneous multipletransmissions of data toward the wireless device taking the receivedmeasurement report into account.

It is herein also provided a computer program comprising instructions,which, when executed on at least one processor, causes the at least oneprocessor to carry out the methods herein, as performed by the wirelessdevice or the radio network node. Furthermore, it is herein provided acomputer-readable storage medium, having stored thereon a computerprogram comprising instructions which, when executed on at least oneprocessor, cause the at least one processor to carry out the methodsherein, as performed by the wireless device or the radio network node.

According to embodiments herein wherein the measurement report isgenerated and comprises certain reference signals, based on theestimated spatial diversity, e.g. different directions, of the referencesignals. E.g. reference signals from a same direction as anotherreference signal, i.e. having a low spatial diversity, are downprioritized to be included into the measurement report. Thus, referencesignals estimated to come from different directions, i.e. having a highspatial diversity, may be weighted with a higher value or prioritized tobe included into the measurement report and are sent in the measurementreport to e.g. a radio network node serving the wireless device. Theradio network node may then decide which reference signals in themeasurement report that should be used for simultaneous multipletransmissions of data to the wireless device. Embodiments herein furtherestimates to what extent the received reference signals are receivedspatially diversified based on the radio network node indication and/orthe beam indication leading to a noncomplex and efficient solution. Thereference signals or beams of the reference signals reported are likelyto have lower correlation resulting in a use of a MIMO channel, i.e. thesimultaneous multiple transmissions, likely to have a higher rank andresulting in a higher throughput and leading to an improved performanceof the wireless communication network.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will now be described in more detail in relation to theenclosed drawings, in which:

FIG. 1 shows a schematic overview depicting a wireless communicationnetwork according to embodiments herein;

FIG. 2 shows a schematic overview depicting a scenario in a wirelesscommunication network according to embodiments herein;

FIG. 3 is a schematic combined flowchart and signalling scheme accordingto embodiments herein;

FIG. 4 is a schematic flowchart depicting a method performed by awireless device according to embodiments herein;

FIG. 5 is a schematic flowchart depicting some methods performed by awireless device according to embodiments herein;

FIG. 6 is a block diagram depicting a wireless device according toembodiments herein;

FIG. 7 is a schematic flowchart depicting a method performed by a radionetwork node according to embodiments herein; and

FIG. 8 is a block diagram depicting a radio network node according toembodiments herein.

DETAILED DESCRIPTION

Embodiments herein relate to wireless communication networks in general.FIG. 1 is a schematic overview depicting a wireless communicationnetwork 1. The wireless communication network 1 comprises one or moreRANs and one or more CNs. The wireless communication network 1 may useone or a number of different technologies, such as Wi-Fi, LTE,LTE-Advanced, Fifth Generation (5G), Wideband Code-Division MultipleAccess (WCDMA), Global System for Mobile communications/enhanced Datarate for GSM Evolution (GSM/EDGE), Worldwide Interoperability forMicrowave Access (WiMax), or Ultra Mobile Broadband (UMB), just tomention a few possible implementations. Embodiments herein relate torecent technology trends that are of particular interest in a 5Gcontext, however, embodiments are also applicable in further developmentof the existing wireless communication systems such as e.g. WCDMA andLTE.

In the wireless communication network 1, wireless devices e.g. awireless device such as a mobile station, a non-access point (non-AP)STA, a STA, a user equipment and/or a wireless terminal, communicate viaone or more Access Networks (AN), e.g. RAN, to one or more core networks(CN). It should be understood by the skilled in the art that “wirelessdevice” is a non-limiting term which means any terminal, wirelesscommunication terminal, user equipment, Machine-Type Communication (MTC)device, Device-to-Device (D2D) terminal, or node e.g. smart phone,laptop, mobile phone, sensor, relay, mobile tablets or even a small basestation capable of communicating using radio communication with a radionetwork node within an area served by the radio network node.

The wireless communication network 1 comprises a radio network node 12,also referred to as a first radio network node, providing radio coverageover a geographical area, a first service area 11 or a first beam, of afirst radio access technology (RAT), such as NR, LTE, Wi-Fi, WiMAX orsimilar. The radio network node 12 may be a transmission and receptionpoint e.g. a radio network node such as a Wireless Local-Area Network(WLAN) access point or an Access Point Station (AP STA), an access node,an access controller, a base station, e.g. a radio base station such asa NodeB, an evolved Node B (eNB, eNode B), a base transceiver station, aradio remote unit, an Access Point Base Station, a base station router,a transmission arrangement of a radio base station, a stand-alone accesspoint or any other network unit or node capable of communicating with awireless device within the area served by the radio network node 12depending e.g. on the first radio access technology and terminologyused. The radio network node 12 may be referred to as a serving radionetwork node wherein the first service area may be referred to as aserving beam, and the radio network node serves and communicates withthe wireless device 10 in form of DL transmissions to the wirelessdevice 10 and UL transmissions from the wireless device 10.

A second radio network node 13 may further provide radio coverage over asecond service area 14 or a second beam of a second RAT, such as NR,LTE, Wi-Fi, WiMAX or similar. The first and second RAT may be the sameRAT or different RATs. The second radio network node 13 may be atransmission and reception point e.g. a radio network node such as aWireless Local-Area Network (WLAN) access point or an Access PointStation (AP STA), an access node, an access controller, a base station,e.g. a radio base station such as a NodeB, an evolved Node B (eNB, eNodeB), a base transceiver station, a radio remote unit, an Access PointBase Station, a base station router, a transmission arrangement of aradio base station, a stand-alone access point or any other network unitor node capable of communicating with a wireless device within the areaserved by the second radio network node 13 depending e.g. on the secondradio access technology and terminology used. The second radio networknode 13 may be referred to as a neighbour radio network node wherein thesecond service area 14 may be referred to as a neighbouring beam.

It should be noted that a service area may be denoted as a cell, a beam,a mobility measurement beam, a beam group or similar to define an areaof radio coverage. The radio network nodes transmit RSs over respectiveservice area. Hence, the first and second radio network nodes transmitMRSs or beam reference signals (BRS), repeatedly, in time, in a largenumber of different directions using as many Tx-beams as deemednecessary to cover an operational area of the respective radio networknode. Hence the radio network node 12 provides radio coverage over thefirst service area using a first reference signal, e.g. a first MRS. Thesecond radio network node 13 provides radio coverage over the secondservice area 14 using a second reference signal, e.g. a second MRS.These reference signals, first and second MRS, may be initiated uponrequest from a radio network node, e.g. a neighboring radio networknode, or configured to be sent continuously. The wireless device 10 maynot know identity of the radio network node 12 from the RS and thisgives the wireless communication network a greater flexibility to usee.g. BRS IDs, i.e., a certain ID of a reference signal does not have tobe reserved for a certain radio network node.

A radio network node can use a limited number x of beams at the sametime for data transmission. If the wireless device is located close tothe radio network node, it is likely to receive many strong referencesignals from the same radio network node. Assume that the wirelessdevice 10 can report y reference signals, where y>x. If the wirelessdevice 10 reports more than x reference signals from the same radionetwork node, this information is useless, because the radio networknode is unable to utilize the beams corresponding to the referencesignals, and Candidate reference signals, i.e. reference signalstransmitted from other radio network nodes may not be reported.

Furthermore, it is generally preferably to transmit data on beams thatreach the wireless device from different directions, i.e. spatiallydiversified, in MIMO transmissions. This is because of fundamentalproperties of multi-antenna systems. A beam can reach the wirelessdevice from different directions if i) the beams originate fromdifferent radio network nodes or ii) the beams is reflected on its wayfrom the radio network node to the wireless device. At the same time,the strongest reference signals are likely to stem from line-of-sightbeams transmitted by the closest radio network node. Therefore,reporting the strongest reference signals is likely to result in a poorselection of beam candidates, in case simultaneously data transmissionson multiple beams are desired.

The wireless device 10 according to embodiments herein generates ameasurement report by adding selected reference signals to be reportedto e.g. the radio network node 12 for simultaneous multipletransmissions of data toward the wireless device, i.e. for MIMOtransmission of a rank equal to two or higher. Thus, the wireless device10 estimates to what extent the received reference signals are receivedspatially diversified based on a radio network node indicationindicating from which radio network node the reference signal was sent,and/or a beam indication indicating in what direction the referencesignal was sent toward the wireless device or at the radio network nodeand then generates the measurement report comprising indications ofreference signals that correspond to beam candidates, which beamcandidates are likely to result in a high throughput when performing aMIMO transmission of data on multiple layers. Hence, the generatedmeasurement report comprises indications of references signals and e.g.corresponding strength values of reference signals, which referencesignals are estimated to be spatially diversified for simultaneousmultiple transmissions of data toward the wireless device 10. Thereference signals, or beams associated to the reference signals,reported according to embodiments herein are likely to have a lowcorrelation and the resulting MIMO channel is therefore likely to have ahigher rank and to result in a higher throughput.

Note that in a general scenario the term “radio network node” can besubstituted with “transmission point”. Several TPs may be logicallyconnected to the same radio network node but if they are geographicallyseparated, or are pointing in different propagation directions, the TPswill be subject to the same issues as different radio network nodes. Insubsequent sections, the terms “radio network node” and “TP” can bethought of as interchangeable.

FIG. 2 shows a schematic overview illustrating how different RSs, orbeams associated to respective RS, reach the wireless device 10. Beams 1and 2 originate from the same radio network node, e.g. the radio networknode 12, and are received via line-of-sight at the wireless device 10.The corresponding reference signals have the highest received powervalues, such as Reference Signal Received Power (RSRP) values, however,they are likely to result in a poor throughput due to high correlation,i.e. the wireless device 10 will not be able to differentiate the beamsand thus will not be able to use these beams for simultaneous multipletransmissions of data toward the wireless device 10. Beam 3 originatesfrom the same radio network node 12, but is reflected before reachingthe wireless device 10. Beam 4 originates from another radio networknode such as the second radio network node 13. If the wireless device 10is able to report two beams only, it should not report beam 1 and beam 2as a pair, which have highest RSRP values. Instead, the wireless device10 reports the pair of beam 1 and another beam that is spatiallydiversified with the strongest beam 1. Hence, the wireless device 10combines the beam with a highest received strength or quality with abeam that has low similarity with respect to the beam 1, e.g. beam 3 or4 in the illustrated example.

According to some embodiments herein, the radio network node 12 maytransmit multiple beam reference signals over a port and the secondradio network node 13 may also transmit beam reference signals. Forexample, beams 1, 2, 3 may be transmitted from the radio network node12, and beam 4 may be transmitted from the second radio network node 13.The wireless device 10 may determine from the reference signals theradio network node indication and/or the beam indication of each beam.Using configuration information transmitted by the network nodes 12 and13, the wireless device may also determine the transmission angles ofthe beams based on the radio network node indication and/or beamindication. At the wireless device 10 the received power of the beam 3may be higher than that of the beam 4. Reference signals that are notassociated with the same radio network node or a beam indicationindicating similar origin as the strongest beam (Beam 1), and, thus, isindicating that the beams are spatially diversified, may get anadditional positive power offset in a reported beam selection algorithm.Instead of beam pair (1,3), beam pair (1, 4) may then be reported. Thismay increase the chance to get multiple beams transmitted to the samewireless device 10, so higher a RANK and higher throughput may beachieved e.g. in the case of limited number of beams from each radionetwork node can be transmitted.

In another embodiment, the radio network node 12 may broadcast thenumber of antenna panels associated with each reference signal sequencein the system information. So the wireless device 10 knows the number ofsimultaneous beams that can be transmitted from the reference signalsequence. For example, in FIG. 2 the radio network node 12 may broadcastsystem information that only one antenna panel is associated with thereference signal, if the wireless device 10 is able to report two beamsonly, instead of report beam (1,3) transmitted with the same beamreference signal (means only one beam can be scheduled), the wirelessdevice 10 should report beam (1, 4) transmitted with difference beamreference signal so it is possible to be scheduled from multiple radionetwork nodes to get higher rank and higher throughput.

This will improve simultaneous multiple transmissions of data to thewireless device 10, which simultaneous multiple transmissions define aMIMO rank of equal to or higher than two. A benefit of using MIMO is tosend several transmission layers at a same time. One example is whenusing analogue beam forming, the radio network node 12 sends multiplebeams to the wireless device 10. Each beam can support at most twotransmission layers, because the beam contains two polarizationdirections. This means that up to 4 transmission layers can betransmitted when using two beams. The number of transmission layers maybe limited by the correlation between the beams. Two beams are likely tobe correlated if they propagate on the same path, e.g., if they are bothreceived via line of sight. Correlation can be interpreted in two ways,which are mathematically the same: i) there is high interference betweenthe two beams, which limits the throughput ii) the correlated channelforms transmission layers, of which some have poor attenuation, i.e.,the transmission layers are weak and cannot carry much throughput. Inthis case, it is better to not use the full number of transmissionlayers. This is called a rank reduction. However, according toembodiments herein the reported references signal (or beams) areavoiding this rank reduction and MIMO transmissions with a rank of twoor higher is facilitated by the generated measurement report.

FIG. 3 is a combined flowchart and signaling scheme according toembodiments herein. The wireless device 10 may be served by the radionetwork node 12 providing the radio coverage over the first service area11 using the first reference signal for identifying the first servicearea 11 in the wireless communication network. The second radio networknode 13 may provide radio coverage over the second service area 14 usingthe second reference signal for identifying the second service area 14in the wireless communication network 1.

Action 301. The wireless device 10 receives reference signals from e.g.the radio network node 12 and the second radio network node 13. Thewireless device 10 may measure signal strength or quality of thereceived reference signals such as MRSs. The RSs are each associatedwith an antenna port, i.e. when the wireless device 10 is performing ameasurement using a particular reference signal, it can be equivalentlysaid that the wireless device 10 is measuring the channel of the antennaport that corresponds to the particular reference signal. If thereference signal is beam-formed, i.e. transmitted with a multi-antennaprecoding vector that generates a beam in a certain pointing direction,one can say that the wireless device 10 is measuring a port of a beam.Since the radio network node 12 may transmit multiple beams, thewireless device 10 may measure on multiple ports of beams in sequence orin parallel.

Action 302. The wireless device 10 estimates to what extent thereferences signals are spatially diversified based on the radio networknode indication indicating from which radio network node the referencesignal was sent, and/or the beam indication indicating in what directionthe reference signal was sent at the radio network node. E.g. thewireless device 10 may determine level of differences of incomingdirections of the reference signals compared to a received referencesignal with highest measured signal strength or quality. As anotherexample, the wireless device 10 may determine a first direction of afirst reference signal, e.g. strongest reference signal, and a seconddirection of a second reference signal forming a deviance factor basedon the determined first and second direction. To estimate to what extentthe received reference signals are spatially diversified, i.e. to whatextent the received reference signals originate from different radionetwork nodes and/or travel different propagation paths, the wirelessdevice 10:

-   -   estimates to what extent the received reference signals are        spatially diversified based on a radio network node indication        such as an eNB index or a TP index, indicating from which radio        network node the reference signal was sent. Beams from different        radio network nodes are likely to be uncorrelated, because they        have different propagation paths and reach the wireless device        from different directions; and/or    -   estimates to what extent the received reference signals are        spatially diversified based on beam indication, such as a beam        index or a reference signal index, indicating in what direction        the beam/reference signal was sent at the radio network node.        Each beam indication may correspond a certain azimuth and/or        elevation at the radio network node (and known to the wireless        device e.g. preconfigured or informed). This results in an        angular difference for each pair of beams. The larger the        angular difference, the lower the likelihood that both beams are        received via line of sight, that is, the higher the likelihood        that the beams have different propagation paths. For example,        beam number x always points in the same direction as an initial        configuration, which means that the angles may be known a        priori, or the beam layout is not specified. Instead, the beams        may be grouped, and it is known a priori that beams within a        group point in a similar direction. Or the angular difference        can be derived from the difference in beam index (beam 13 is        further apart from beam 1 than from beam 12).

Action 303. The wireless device 10 may according to some embodimentscombine the strength and the estimate to what extent the receivedreference signals are spatially diversified. The wireless device 10 maye.g. calculate a metric for a similarity of each pair of referencesignals, taking the estimates described above into account. An exampleis described in action 505 herein. The wireless device 10 may thenmaximize a metric that depends on the signal strength or quality as wellas on the similarity (or dissimilarity) of the selected beams.

Action 304. The wireless device 10 then generates the measurement reportwith reference signals that are selected for simultaneous multipletransmissions of data to the wireless device 10. The wireless device 10may then add reference signals and/or measurements of the referencesignals to the measurement report based on whether the reference signalsare received spatially diversified since spatial diversity facilitatesor allows simultaneous multiple transmissions of data to the wirelessdevice 10. The wireless device 10 may e.g. estimate directions of eachof the received reference signal and take the estimated directions intoaccount when adding measurements and reference signals into themeasurement report, e.g. based on the radio network node indications orbeam indications.

Action 305. The wireless device 10 transmits the generated measurementreport to e.g. the radio network node 12 serving the wireless device 10.Thus, the wireless device 10 reports the reference signals thatcorrespond to good beam candidates for simultaneous multipletransmissions of data toward the wireless device 10. Being a good beamcandidate is based on the estimation that the reference signals arespatially diversified. Thus, the wireless device 10 may transmit ameasurement report comprising a first indication of an identity of afirst reference signal with a strongest measured signal strength orquality and the corresponding measured signal strength or quality, and asecond indication of an identity of a second reference signal with ameasured signal strength or quality, which second reference signal isspatially diversified from the first reference signal and alsocorresponding measured signal strength or quality. Hence, themeasurement report may indicate the added reference signals and thecorresponding signal strength or quality of the added reference signals.

Action 306. The radio network node 12 receives the measurement reportand may determine reference signals or beams to be used for simultaneousmultiple transmissions of data toward the wireless device 10 based onthe received measurement report. E.g. the measurement report is sent toa scheduler that may control several radio network nodes such as TPs.Potentially, the performance of the beam candidates determined byembodiments herein is evaluated further by using other mechanisms, e.g.using the CSI-RS in a NR network. Embodiments herein do not only takereceived strength into account, but estimates the throughput of usingseveral beams concurrently. Based on those estimated throughputs, thescheduler decides which beams from which radio network node to use forwhich wireless device(s) at which time. Hence, the radio network node 12decides on what beams the wireless device 10 will be scheduled. Theseselected reference signals or beams may be signalled to the wirelessdevice 10 informing the wireless device which reference signals/beamswill be used for multiple data transmissions.

Action 307. The radio network node 12 and/or the second radio networknode 13 may then transmit data to the wireless device 10 in simultaneousmultiple transmissions.

The method actions performed by the wireless device 10 for managing orhandling communication in the wireless communication network 1 accordingto some embodiments will now be described with reference to a flowchartdepicted in FIG. 4. The actions do not have to be taken in the orderstated below, but may be taken in any suitable order. Actions performedin some embodiments are marked with dashed boxes.

Action 400. The wireless device 10 may obtain, e.g. receive from theradio network node 12 or be pre-configured with, configuration datadefining a mapping of reference signals to radio network nodeindications and/or beam indications. Thus, the radio network node 12 andthe wireless device 10 may agree upon this mapping. This enables thewireless device 10, if the wireless device 10 receives a referencesignal at a certain position in time and frequency, to figure out ordetermine what radio network node and/or beam that corresponds to thatreference signal.

Action 401. The wireless device 10 receives the reference signals fromone or more radio network nodes. The wireless device 10 may e.g. receivereference signals of different beams from the radio network node 12and/or the second radio network node 13. This is exemplified in Action301 in FIG. 3. The wireless device 10 receives the reference signals atcertain time/frequency resources and each reference signal may have acertain index at the wireless device side as configured in action 400,i.e. according to the mapping between e.g. that index and the radionetwork node and beam indices.

Action 402. The wireless device 10 may measure signal strength orquality of the received reference signals.

Action 403. The wireless device 10 estimates to what extent the receivedreference signals are received spatially diversified. The wirelessdevice 10 estimates to what extent the received reference signals arereceived spatially diversified based on: a radio network node indicationsuch as an eNB index or a TP index, indicating from which radio networknode the reference signal was sent and/or a beam indication, such as abeam index or a reference signal index, indicating in what direction thebeam/reference signal was sent toward the wireless device. Each beamindication may correspond a certain azimuth and/or elevation at theradio network node. This results in an angular difference for each pairof beams. The larger the angular difference, the lower the likelihoodthat both beams are received via line of sight, that is, the higher thelikelihood that the beams have different propagation paths. Spatiallydiversified means that the references signals are e.g. originating fromdifferent radio network nodes and/or travel different propagation paths.This is exemplified in Action 302 in FIG. 3.

Action 404. The wireless device 10 generates the measurement report byadding selected reference signals into the measurement report, whichreference signals are selected for simultaneous multiple transmissionsof data to the wireless device 10 taking into account the estimatedextent that the received reference signals are received spatiallydiversified. The wireless device 10 may generate the measurement reportby taking the direction of the reference signal based on the radionetwork node indication and/or beam indication into account whenselecting reference signals to add to the measurement report. Thewireless device 10 may generate the measurement report by addingreference signals to the measurement report based on the measured signalstrength or quality of received reference signals, and the estimation towhat extent the references signals are spatially diversified. Thesimultaneous multiple transmissions may define or be defined by a rankbeing equal or higher than two for MIMO transmissions. This isexemplified in Action 304 in FIG. 3.

Action 405. The wireless device 10 transmits the measurement report to aradio network node such as the radio network node 12 or the second radionetwork node 13 in the wireless communication network 1. This isexemplified in Action 305 in FIG. 3.

Action 406. The wireless device 10 may then receive data oversimultaneous multiple transmissions using beams of reference signalsadded into the measurement report. That is, the wireless device 10 mayreceive data over beams simultaneously, which beams are corresponding totwo or more reference signals previously added into the measurementreport. As stated above in action 306, the radio network node 12 or thescheduler of the radio network node determines what beams to use takinginto account also other wireless devices' reports and other means ofestimating throughput.

FIG. 5 is a schematic flowchart depicting a method performed by thewireless device 10 for managing communication toward the wirelessdevice.

The actions do not have to be taken in the order stated below, but maybe taken in any suitable order. Actions performed in some embodimentsare marked with dashed boxes.

Action 501. The wireless device 10 receives reference signals asmentioned in actions 301, and 401 herein.

Action 502. The wireless device 10 measures or estimates signal strengthor quality, such as RSRP, of the different received reference signals.The wireless device 10 may e.g. select the first reference signal withthe strongest or highest signal strength or quality measured as thereference point.

As stated above the wireless device 10 estimates to what extent thereceived reference signals are received spatially diversified, seeactions 302 and 403 above. This may be performed in the following waydescribed in actions 503-504.

Action 503. The wireless device 10 may estimate to what extent thereceived reference signals are spatially diversified based on the radionetwork node indication such as the eNB index or the TP index,indicating from which radio network node the reference signal was sent.

Action 504. The wireless device 10 may estimate to what extent thereceived reference signals are spatially diversified based on the beamindication, such as the beam index or the reference signal index,indicating in what direction the beam/reference signal was sent at theradio network node. Each beam indication may correspond a certainazimuth and/or elevation at the radio network node, which may be used todetermine the angular difference for each pair of beams. E.g. beam index10 is considered to have a larger angular difference to beam index 1than beam index 5.

Action 505. The wireless device 10 may calculate the metric for thesimilarity of each pair of reference signals/beams, taking the estimatesdescribed above into account, this may be denoted the similarity metriccalculation. The y reported reference signals are then selected bymaximizing a metric that depends on the RSRP values as well as on thesimilarity of the selected beams, which is based on beam indication orradio network node indication. Thus, these indications may be used todetermine the angular difference for determining or calculating themetric for the similarity of each pair of reference signals/beams. As anexample, for each pair of beams x and y, a diversity factor d_xy may becalculated. The diversity factor takes values between 1 (largestpossible spatial diversity of beams) and 0 (smallest possible diversityof beams). Beams with dissimilar radio network node indications e.g. TPindices, stemming from different radio network nodes, are assignedspatial diversity d_xy=1. The beam indications are not evaluated in thiscase. Beams with similar radio network node indications, stemming fromthe same radio network node indications, are assigned a similarity basedon the beam indications b_x and b_y, which beam indications indicateunder what angle the beams were transmitted. For each beam indication,azimuth and elevation angles describe the direction of transmission.This yields an angle, a_xy, between the transmission directions of beamsb_x and b_y in the interval between 0 and 180 degrees. A thresholdangle, t, may be defined. If a_xy is larger than t, the two beams areconsidered fully spatially diversified. Also, a residual diversity r maybe defined. This is the spatial diversity of two beams, which aretransmitted in the same direction. The spatial diversity can becalculated asd_xy=min(1,(a_xy/t)+r)

After the spatial diversity for all beam pairs have been calculated, thebeams that should be reported to the radio network node can be selected,see action 506, as follows, utilizing a greedy approach:

-   -   select a first beam b_1 with strongest BRS;    -   select a second beam b_2 that has best joint performance with        b_1 by maximizing    -   max_i (BRS_i*d_1i), where BRS_i is signal strength of BRS_i;    -   select a third beam b_3 that has best joint performance with b_1        and b_2: max_i (BRS_i*d_1i*d_2i)

and so on.

Action 506. The wireless device may then perform the joint beam reportselection. The wireless device 10 may have all the spatial diversityd_xy for all pairs (x,y) of beams and based on this information thewireless device 10 selects which set of beams to report in themeasurement report. The wireless device 10 then reports not thestrongest reference signals, but the reference signals that correspondto good beam candidates for MIMO transmissions. I.e. beams that arelikely to provide high throughput using multiple data transmissions,simultaneously, toward the wireless device 10. The reported referencesignals may be determined by maximizing a metric that depends on e.g.the RSRP values as well as on the similarity of the selected beams. Asan example, the wireless device 10 might report at most a<y beams fromeach radio network node or TP. Then for each radio network node, thebeams reported back might be selected using a greedy strategy: Selectthe beam with a strongest RSRP as the first beam; Select consecutivebeams based on strongest RSRP, including a penalty for small angulardifference to beams that have been selected before. Thus, beam directedfrom different angles are weighted more than beams coming from a similardirection.

The wireless device 10 then reports not the strongest reference signals,but the reference signals that correspond to good beam candidates forMIMO transmissions. I.e. beams that are likely to provide highthroughput using multiple data transmissions, simultaneously, toward thewireless device 10.

FIG. 6 is a block diagram depicting the wireless device 10 for managingcommunication in the wireless communication network 1 according toembodiments herein.

The wireless device 10 may comprise a processing unit 601, e.g. one ormore processors, configured to perform the methods herein.

The wireless device 10 may comprise a receiving module 602, e.g. areceiver or a transceiver. The wireless device 10, the processing unit601 and/or the receiving module 602 is configured to receive referencesignals from one or more radio network nodes.

The wireless device 10 may comprise an estimating module 603. Thewireless device 10, the processing unit 601 and/or the estimating module603 is configured to estimate to what extent the received referencesignals are received spatially diversified based on the radio networknode indication indicating from which radio network node the referencesignal was sent, and/or the beam indication indicating in what directionthe reference signal was sent toward the wireless device.

The wireless device 10 may comprise a generating module 604. Thewireless device 10, the processing unit 601 and/or the generating module604 is configured to generate the measurement report by adding theselected reference signals into the measurement report. The referencesignals are selected for simultaneous multiple transmissions of data tothe wireless device 10 taking into account the estimated extent that thereceived reference signals are received spatially diversified. Thewireless device 10, the processing unit 601 and/or the generating module604 may be configured to generate the measurement report by beingconfigured to take the direction of the reference signal based on theradio network node indication and/or beam indication into account whenselecting reference signals to add to the measurement report.

The wireless device 10 may comprise a transmitting module 605, e.g. atransmitter or a transceiver. The wireless device 10, the processingunit 601 and/or the transmitting module 605 is configured to transmitthe measurement report to a radio network node, e.g. the radio networknode 12, in the wireless communication network 1.

The wireless device 10 may comprise a measuring module 606. The wirelessdevice 10, the processing unit 601 and/or the measuring module 605 maybe configured to measure the signal strength or quality of the receivedreference signals. The wireless device 10, the processing unit 601and/or the generating module 604 may be configured to generate themeasurement report by being configured to add reference signals to themeasurement report based on the measured signal strength or quality ofreceived reference signals and the estimation to what extent thereferences signals are spatially diversified.

The wireless device 10, the processing unit 601 and/or the receivingmodule 602 may further be configured to receive data over simultaneousmultiple transmissions, which multiple transmissions use beams withreference signals added into the measurement report.

The wireless device 10 further comprises a memory 607. The memorycomprises one or more units to be used to store data on, such as datarelating to reference signals, signal strengths or qualities, IDs ofreference signals, spatial diversity information, mappings, applicationsto perform the methods disclosed herein when being executed, andsimilar.

The methods according to the embodiments described herein for thewireless device 10 are respectively implemented by means of e.g. acomputer program 708 or a computer program product, comprisinginstructions, i.e., software code portions, which, when executed on atleast one processor, cause the at least one processor to carry out theactions described herein, as performed by the wireless device 10. Thecomputer program 708 may be stored on a computer-readable storage medium709, e.g. a disc or similar. The computer-readable storage medium 709,having stored thereon the computer program, may comprise theinstructions which, when executed on at least one processor, cause theat least one processor to carry out the actions described herein, asperformed by the wireless device 10. In some embodiments, thecomputer-readable storage medium may be a non-transitorycomputer-readable storage medium.

The method actions performed by the radio network node 12 for managingor handling communication of the wireless device 10 in the wirelesscommunication network 1 according to some embodiments will now bedescribed with reference to a flowchart depicted in FIG. 7. The actionsdo not have to be taken in the order stated below, but may be taken inany suitable order. Actions performed in some embodiments are markedwith dashed boxes.

Action 701. The radio network node 12 transmits configuration data tothe wireless device 10, which configuration data indicates the mappingof reference signals to radio network node indications and/or beamindications.

Action 702. The radio network node 12 further receives the measurementreport comprising selected reference signals, which reference signalsare selected for simultaneous multiple transmissions of data to thewireless device 10 taking into account to what estimated extent receivedreference signals are received spatially diversified.

Action 703. The radio network node 12 determines reference signals orbeams to use for simultaneous multiple transmissions of data toward thewireless device 10 taking the received measurement report into account.

Action 704. The radio network node 12 may further transmit data oversimultaneous multiple transmissions, which multiple transmissions usethe determined beams with e.g. reference signals added into themeasurement report.

FIG. 8 is a block diagram depicting the radio network node 12 formanaging communication in the wireless communication network 1 accordingto embodiments herein.

The radio network node 12 may comprise a processing unit 801, e.g. oneor more processors, configured to perform the methods herein.

The radio network node 12 may comprise a transmitting module 802, e.g. atransmitter or a transceiver. The radio network node 12, the processingunit 801 and/or the transmitting module 802 is configured toconfiguration data to the wireless device 10, which configuration dataindicates the mapping of reference signals to radio network nodeindications and/or beam indications.

The radio network node 12 may comprise a receiving module 803, e.g. areceiver or a transceiver. The radio network node 12, the processingunit 801 and/or the receiving module 803 is configured to receive themeasurement report comprising selected reference signals, whichreference signals are selected for simultaneous multiple transmissionsof data to the wireless device 10 taking into account to what estimatedextent received reference signals are received spatially diversified.

The radio network node 12 may comprise a determining module 804. Theradio network node 12, the processing unit 801 and/or the determiningmodule 804 is configured to determine reference signals or beams to usefor simultaneous multiple transmissions of data toward the wirelessdevice 10 taking the received measurement report into account. The radionetwork node 12, the processing unit 801 and/or the transmitting module801 may further be configured to transmit data over simultaneousmultiple transmissions, which multiple transmissions use the determinedbeams with e.g. reference signals added into the measurement report.

The radio network node 12 further comprises a memory 805. The memorycomprises one or more units to be used to store data on, such as datarelating to reference signals, signal strengths or qualities, IDs ofreference signals, spatial diversity information, mappings, applicationsto perform the methods disclosed herein when being executed, andsimilar.

The methods according to the embodiments described herein for the radionetwork node 12 are respectively implemented by means of e.g. a computerprogram 806 or a computer program product, comprising instructions,i.e., software code portions, which, when executed on at least oneprocessor, cause the at least one processor to carry out the actionsdescribed herein, as performed by the radio network node 12. Thecomputer program 806 may be stored on a computer-readable storage medium807, e.g. a disc or similar. The computer-readable storage medium 807,having stored thereon the computer program, may comprise theinstructions which, when executed on at least one processor, cause theat least one processor to carry out the actions described herein, asperformed by the radio network node 12. In some embodiments, thecomputer-readable storage medium may be a non-transitorycomputer-readable storage medium.

In some embodiments a more general term “radio network node” is used andit can correspond to any type of radio network node or any network node,which communicates with a wireless device and/or with another networknode. Examples of network nodes are NodeB, Master eNB, Secondary eNB, anetwork node belonging to Master cell group (MCG) or Secondary CellGroup (SCG), base station (BS), multi-standard radio (MSR) radio nodesuch as MSR BS, eNodeB, network controller, radio network controller(RNC), base station controller (BSC), relay, donor node controllingrelay, base transceiver station (BTS), access point (AP), transmissionpoints, transmission nodes, Remote Radio Unit (RRU), Remote Radio Head(RRH), nodes in distributed antenna system (DAS), core network node e.g.Mobility Switching Centre (MSC), Mobile Management Entity (MME) etc,Operation and Maintenance (O&M), Operation Support System (OSS),Self-Organizing Network (SON), positioning node e.g. Evolved ServingMobile Location Centre (E-SMLC), Minimizing Drive Test (MDT) etc.

In some embodiments the non-limiting term wireless device or userequipment (UE) is used and it refers to any type of wireless devicecommunicating with a network node and/or with another UE in a cellularor mobile communication system. Examples of UE are target device,device-to-device (D2D) UE, proximity capable UE (aka ProSe UE), machinetype UE or UE capable of machine to machine (M2M) communication,Personal Digital Assistant (PDA), PAD, Tablet, mobile terminals, smartphone, laptop embedded equipped (LEE), laptop mounted equipment (LME),Universal Serial Bus (USB) dongles etc.

The embodiments are described for 5G. However the embodiments areapplicable to any RAT or multi-RAT systems, where the UE receives and/ortransmit signals (e.g. data) e.g. LTE, LTE FDD/TDD, WCDMA/HSPA,GSM/GERAN, Wi Fi, WLAN, CDMA2000 etc.

Measurement Reference Signal (MRS): As used herein, a “MRS” is anysignal used for mobility measurements in beams. Thus, while the term“MRS” is used herein to refer a signal used herein, the term “MRS” is tobe construed broadly to mean any signal, regardless of what the signalis named, e.g., in any particular standard, used for mobilitymeasurements and, in particular, used according to the embodimentsdescribed herein. In some embodiments, a MRS is a mobility specificsignal that is used for handover/beam switching purposes. This referencesignal can be periodic or aperiodic. It can be configured to be wirelessdevice specific or could be used common for more than one wirelessdevice.

Antenna node: As used herein, an “antenna node” is a unit capable ofproducing one or more beams covering a specific service area ordirection. An antenna node can be a base station, or a part of a basestation.

As will be readily understood by those familiar with communicationsdesign, that functions means or modules may be implemented using digitallogic and/or one or more microcontrollers, microprocessors, or otherdigital hardware. In some embodiments, several or all of the variousfunctions may be implemented together, such as in a singleapplication-specific integrated circuit (ASIC), or in two or moreseparate devices with appropriate hardware and/or software interfacesbetween them. Several of the functions may be implemented on a processorshared with other functional components of a wireless device or networknode, for example.

Alternatively, several of the functional elements of the processingmeans discussed may be provided through the use of dedicated hardware,while others are provided with hardware for executing software, inassociation with the appropriate software or firmware. Thus, the term“processor” or “controller” as used herein does not exclusively refer tohardware capable of executing software and may implicitly include,without limitation, digital signal processor (DSP) hardware, read-onlymemory (ROM) for storing software, random-access memory for storingsoftware and/or program or application data, and non-volatile memory.Other hardware, conventional and/or custom, may also be included.Designers of communications devices will appreciate the cost,performance, and maintenance tradeoffs inherent in these design choices.

It will be appreciated that the foregoing description and theaccompanying drawings represent non-limiting examples of the methods andapparatus taught herein. As such, the apparatus and techniques taughtherein are not limited by the foregoing description and accompanyingdrawings. Instead, the embodiments herein are limited only by thefollowing claims and their legal equivalents.

The invention claimed is:
 1. A method performed by a wireless device formanaging communication in a wireless communication network, the methodcomprising: receiving reference signals from one or more radio networknodes; estimating to what extent the received reference signals arereceived spatially diversified based on a radio network node indicationindicating from which radio network node a reference signal was sent,and/or a beam indication indicating in what direction the referencesignal was sent toward the wireless device; generating a measurementreport by adding selected reference signals into the measurement report,which reference signals are selected for simultaneous multipletransmissions of data to the wireless device taking into account theestimated extent that the received reference signals are receivedspatially diversified; and transmitting the measurement report to aradio network node in the wireless communication network.
 2. The methodaccording to claim 1, wherein generating the measurement report takes adirection of the reference signal based on the radio network nodeindication and/or beam indication into account when selecting referencesignals to add to the measurement report.
 3. The method according toclaim 1, further comprising measuring signal strength or quality of thereceived reference signals and generating the measurement reportcomprises adding reference signals to the measurement report based onthe measured signal strength or quality of received reference signals,and the estimation to what extent the references signals are spatiallydiversified.
 4. The method according to claim 1, further comprisingreceiving data over simultaneous multiple transmissions using beams ofreference signals added into the measurement report.
 5. The methodaccording to claim 1, further comprising obtaining configuration datadefining a mapping of reference signals to radio network nodeindications and/or beam indications.
 6. A wireless device for enablingmanaging communication in a wireless communication network, wherein thewireless device comprises a processing unit and a memory, said memorycomprising instructions executable by said processing unit whereby saidwireless device is operative to: receive reference signals from one ormore radio network nodes; estimate to what extent the received referencesignals are received spatially diversified based on a radio network nodeindication indicating from which radio network node a reference signalwas sent, and/or on a beam indication indicating in what direction thereference signal was sent toward the wireless device; generate ameasurement report by adding selected reference signals into themeasurement report, which reference signal are selected for simultaneousmultiple transmissions of data to the wireless device taking intoaccount the estimated extent that the received reference signals arereceived spatially diversified; and to transmit the measurement reportto a radio network node in the wireless communication network.
 7. Thewireless device according to the claim 6, wherein said memory comprisesfurther instructions executable by said processing unit whereby saidwireless device is operative to generate the measurement report by beingoperative to take a direction of the reference signal based on the radionetwork node indication and/or beam indication into account whenselecting reference signals to add to the measurement report.
 8. Thewireless device according to claim 6, wherein said memory comprisesfurther instructions executable by said processing unit whereby saidwireless device is operative to measure signal strength or quality ofthe received reference signals and to generate the measurement report bybeing configured to add reference signals to the measurement reportbased on the measured signal strength or quality of received referencesignals, and the estimation to what extent the references signals arespatially diversified.
 9. The wireless device according to claim 6,wherein said memory comprises further instructions executable by saidprocessing unit whereby said wireless device is operative to receivedata over simultaneous multiple transmissions, which multipletransmissions use beams with reference signals added into themeasurement report.
 10. The wireless device according to claim 6,wherein said memory comprises further instructions executable by saidprocessing unit whereby said wireless device is operative to obtainconfiguration data defining a mapping of reference signals to radionetwork node indications and/or beam indications.